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Alternative Water Supplies: Wastewater Reuse by Groundwater Recharge

Alternative Water Supplies: Wastewater Reuse by Groundwater Recharge. Population Growth. High Demand Less Resource. Less Resource Resource Control. Regional water rule turns off tap to the Biscayne Aquifer in SE Florida. Regional System Water Availability Rule (2007)

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Alternative Water Supplies: Wastewater Reuse by Groundwater Recharge

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  1. Alternative Water Supplies:Wastewater Reuse by Groundwater Recharge

  2. Population Growth High Demand Less Resource Less Resource Resource Control

  3. Regional water rule turns off tap to the Biscayne Aquifer in SE Florida • Regional System Water Availability Rule (2007) • Locked in current levels • No additional Biscayne use • Alternative Water Supply

  4. Alternative Water Supplies • Floridan Aquifer • Aquifer Storage & Recovery • Demand Management • Wastewater Reuse • Irrigation (Purple Pipe) • Surface Water Recharge • Groundwater Recharge

  5. Purple Pipe:Limited Application in SE Florida • Treatment • Simple • Cost-Effective • Construction in built out areas: • Expensive • Disruptive • Opportunistic use

  6. Surface Discharge: Costly Treatment / Credit Uncertain • Wetlands • Canals • Nutrient removal • Regulatory issues • Impaired waters • TMDLs • Costly treatment • Low Permit Credit

  7. City of SunrisePilot Study Advanced WW Treatment for Groundwater Recharge

  8. Pilot Study Objectives • Treat Raw Wastewater • Florida Standards • Broward Co. Standards • Groundwater Recharge • Nutrient (P) Removal to Low Levels • Full Scale Application at Sunrise Southwest Facilities

  9. Water Quality Standards

  10. Pilot Plant SunriseSW WWTF Stirling Road Southwest WTP Existing Plant • Rated - 0.99 mgd • Permit - 0.5 mgd • Oxidation Ditches • Percolation Ponds • Destined to be decommissioned I-75 Southwest WWTF

  11. Proposed Upgrade to SW WWTF Proposal • Upgrade to 2.0 mgd • Convert Existing Facilities • Add MBRs • Recharge Aquifer I-75 Pilot Plant Site PercolationPonds Oxidation Ditches

  12. Wellfield Protection Zones Production Wells ZONE 1 Zone 1 – 10 day Zone 2 – 30 day Zone 3 – 210 day ZONE 2 Regional Groundwater Flow ZONE 3 1,100 ft Flow Paths Rapid Infiltration Trenches Groundwater Mounding

  13. Infiltration Trenches Perforated Overflow Collectors Cap Rock Layer Perforated Pipe Geotextile Filter Source: USEPA, 1994

  14. Pilot TreatmentStreams • Control Stream • MBR Only • Stream A • MBR + RO • Stream B • MBR + Chem P Removal

  15. MBR Pilot Unit

  16. Customized MBR Pilot Design based on BiowinTM ANAEROBIC ANOXIC AEROBIC POST-ANOXIC MBR TANK Alum Acetate Caustic Influent RAS Permeate WAS

  17. Influent Wastewater Characterization

  18. Suspended Solids Removal

  19. Nitrogen Removal

  20. Phosphate Removal

  21. MicroconstituentRemoval/Oxidation Study • Microconstituents emerging issue • Wide variety present in wastewaters • Pharmaceuticals (Analgesics, Antibiotics, Antidepressents, Contraceptives, Steroidal hormones, Lipid Control Drugs, etc…) • Stimulants (caffeine) • Pesticides • Impact on future treatment requirements

  22. Critical Cost Factors • Additional P Removal Required? • RO Required? • UV Dose • Microconstituent Removal (future)

  23. Public Health and Perception • Keep public informed • Engage community and industry leaders • Address issues such as Microconstituents

  24. Thank You

  25. Thank You

  26. Water Quality Goals • State of Florida • FAC 62-520.420 Class G-1 Drinking Water Stds • FAC 62-610 Reclaimed Water/Land Application • FAC 62-610.521 & 525 – Setback Requirements • FAC 62-650 Effluent Limitations • Broward County Effluent Standards • Municipal Codes Chapter 27 Section 196(b) regulates effluent discharge to groundwater

  27. Thank You

  28. Wastewater Characterization

  29. ProjectSchedule • Start-Up • Set-Up • Seeding • Two Months • Testing • Four Months • Total • Six Months • Completion • Sep 2007

  30. Floridan Aquifer will provide short-term relief • Deep aquifer/ saline water • RO treatment • Sustainability issues

  31. ASRs have not yieldedthe expected returns • Regulatory issues • Recovery issues (%) • Volume generated • Well-drilling costs • Convert to Floridan

  32. Containerized MBR Pilot Unit

  33. Selection of Micropollutants • Likelihood of occurrence • Major modes of action • Chemical properties and effect on removal efficacy • Analytical methods availability • Cost of analysis

  34. Target Micropollutants • Analgesics – ibuprofin, acetaminophen • Antibiotics – trimethoprin, acetaminophen • Stimulants - caffeine • Contraceptives - ethinylestradiol • Antibacterials - triclosan • Steroidal hormones – progesterone, testosterone • Pesticides – atrazine, carbaryl, diazinon • Antidepressents - fluoxetine • Lipid Control Drugs – gemfibrozil • Viruses

  35. Wastewater Characterization

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